|Publication number||US4889480 A|
|Application number||US 07/278,855|
|Publication date||Dec 26, 1989|
|Filing date||Dec 2, 1988|
|Priority date||Nov 22, 1988|
|Also published as||EP0370142A1|
|Publication number||07278855, 278855, US 4889480 A, US 4889480A, US-A-4889480, US4889480 A, US4889480A|
|Inventors||Susumu Nakamura, Koichi Yokoi|
|Original Assignee||Sankyo Engineering Co., Ltd.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (2), Referenced by (88), Classifications (8), Legal Events (4)|
|External Links: USPTO, USPTO Assignment, Espacenet|
1. Field of the Invention
The present invention relates, among molds for injection molding a material such as molten synthetic resins, to a slide core mold for injection molding synthetic resins, in which an undercut core for molding a depression or the like separately from a main molding in a peripheral edge lower portion of a molded article is slidably moved in and out of a side edge of a main core.
2. Description of the Prior Art
Generally, undercut molding for molding a depression and a cut separately from a main molding in a peripheral edge lower portion of a molded article should be performed by protruding an undercut core for molding an undercut portion into a recess of a core mold separately from a core mold which is a main body. Therefore, in the past, a slide core mold provided with a slide mechanism portion has been used in which when a mold is opened to remove a molded article, an undercut-portion molding core protruded into a recess of the molded article can be moved backward in association therewith so as to remove the molded article. In the past, the slide mechanism of the type as described is designed so that an undercut core and a slider block provided with an inclined hole are slidably provided on the side of a core mold, an inclined pin is provided at a corresponding position of a cavity mold corresponding to a position of said inclined hole, the slider block being moved forward and backward while being guided according to a degree of fitting of the inclined pin into the inclined hole.
However, in the conventional slide mechanism using the inclined pin and the inclined hole, the pin is caught so that it may not be fitted into the hole unless the angle of inclination thereof is precisely met the pin and the hole, and therefore, extremely high precision is required. In addition, the steps of manufacturing a mold increases thus making it difficult to manufacture a mold. Moreover, there gives rise to a problem in that where the width of the slider is large, a partial guide merely using two points on opposite sides of the slider is unstable, and therefore, it is necessary to increase the number of guiding inclined pins and to enlarge the diameter of the pin.
It is an object of the present invention to provide a slide core mold for injection molding which is simple in construction, less in the number of steps of manufacturing a mold, involves no trouble, can be operated positively, and can be freely applied even to a slide core having a large width.
A slide core mold for injection molding according to the present invention employs, in place of the conventional fitting sliding between an inclined pin and an inclined hole which requires a high precision, an inclined-surface sliding which is simple in construction, whereby the sliding is propelled by the joined pressing force thereof.
More specifically, an inclined surface formed with guide grooves in opposite sides thereof is provided in the back of a slider block provided on the side of a core mold, and a block body provided with a projection fitted into the guide groove and an inclined surface is projected at a corresponding position on the side of a cavity fitted into the core mold.
In addition, with respect to the reciprocating sliding of the slider block, a spring is disposed between the slider block and a stroke end so that forward movement thereof is positively effected by the pressing force of the inclined surface whereas the backward movement thereof is positively effected by the restoring force of the spring.
Accordingly, in the slide mechanism portion constructed as described above, the operation of opening and closing the cavity mold and the core mold is accomplished by being converted into a force at right angles to the inclined surface by the action of the inclined surface, and therefore, the pressing force caused by the inclined-surface joining is linked with the positive reciprocation of the slider block.
Moreover, since the shape of the propelling mechanism portion is simple, and therefore the number of steps of manufacturing a slide mechanism portion will suffice to be small, and even if the width of the slider block is large, the stable sliding effect can be secured by a single inclined surface.
FIG. 1 is a longitudinal sectional side view of a slide core mold for injection molding according to the present invention in its parted state;
FIG. 2 is a longitudinal sectional side view in the fitted state thereof, FIGS. 2A and 2B respectively being enlarged views of portions A and B; and
FIG. 3 is a perspective view of a slider block and a projected block body showing the contacting and sliding state of a pressure receiving inclined surface of a slider block with respect to a pressing inclined surface of a projected block body.
An embodiment of the present invention will be described hereinafter with reference to the drawings. Reference numeral 1 designates a core mold locking frame in which a core mold 3 provided with a guide hole 2 in a main end edge and constituting a convex-shaped molded article shape portion is fixedly fastened by a fastening member.
The core mold 3 is formed in its end edge with a fitting portion 41 into which is fitted an undercut core 4 for molding an undercut portion of a molded article, the undercut 4 being fitted into the fitting portion 41 when the core 4 is moved forward.
The rear end of the undercut 4 constitutes a fitting portion 41, and the undercut core 4 is inserted from the side and fitted into a slider block 42 with a slight clearance from an engaging groove 43 provided in the slider block 42, the undercut core 4 being mounted and fitted in the slider block 42.
It is noted that another method can be employed to mount the undercut core 4 on the slider block 42 and that the undercut core 4 may be of course molded integral with the slider block 42.
The slider block 42 is provided with a pressure receiving inclined surface 44 formed at the back thereof and is slidably mounted by a slider guide 7 on the locking frame 1. A pressing inclined surface 45 formed on the front portion of a block body 36 provided on a cavity mold locking frame 11 is pressed in contact with the pressure receiving inclined surface 44 of the slider block 42 so as to effect a reciprocating motion, forward and backward, according to engagement and disengagement of the locking frames 1 and 11 guided by the pressure receiving inclined surface 44 depending on the angle of inclination of the pressing inclined surface 45.
Reference numeral 6 designates guide grooves provided on opposite sides of the pressure receiving inclined surface 44, and guide projections 61 provided on the opposite sides of the pressing inclined surface 45 are fitted therein to guide the operation of the block.
The cavity mold locking frame 11 is provided with a guide pole 21 inserted and fitted into the guide hole 2, and a cavity mold 31 constituting a recess-shape molded article shape portion is fitted into the central portion and fixedly fastened by a fastening member.
Reference numeral 5 designates a nozzle touch of an injection molding machine, and a material injected from a nozzle is filled into the molded article shape cavity 33 and undercut space 35 through an injection hole 12 of the locking frame 11, and an injection hole 32 of a mold 31. Upon completion of molding, a molded article is removed by a pin projected from a projecting pin hole 34.
Since the apparatus of the present invention is constructed as described above, the operating mechanism portion of the slide core is simplified, the number of steps is small which is advantageous in terms of production. The operation is positive with less trouble, and the apparatus can be smoothly applied even to the slide core having a large width.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US2292593 *||Feb 24, 1939||Aug 11, 1942||Amigo Alfonso||Injection molding apparatus for synthetic materials|
|US4515342 *||Apr 6, 1984||May 7, 1985||Borislav Boskovic||Slide retainer|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US5078202 *||Sep 17, 1990||Jan 7, 1992||Doehler-Jarvis Limited Partnership||Floating wedge lock for slide on movable die|
|US5135382 *||Mar 11, 1991||Aug 4, 1992||Fuji Jukogyo Kabushiki Kaisha||Mold for forming composite-material structures|
|US5204127 *||May 10, 1991||Apr 20, 1993||Composite Products, Inc.||Compression molding apparatus|
|US5219594 *||Aug 10, 1992||Jun 15, 1993||Occidental Chemical Corporation||Apparatus for molding undercut parts|
|US5227079 *||Nov 6, 1991||Jul 13, 1993||Crellin B. V.||Plastic cheese mould with drainage slits formed during the manufacture of the upright wall by injection moulding|
|US5449282 *||Nov 1, 1993||Sep 12, 1995||Gencorp Inc.||Self-centering molding apparatus|
|US5536161 *||Sep 22, 1995||Jul 16, 1996||North America Packaging Corporation||Double lock pail mold|
|US5558883 *||Dec 28, 1994||Sep 24, 1996||Mitsui Toatsu Chemicals, Inc.||Mold design and process for producing a multilayer part by injection process molding|
|US5587189 *||Oct 18, 1995||Dec 24, 1996||Wako Plastics Industries Co., Ltd.||Molding device for register of synthetic resin|
|US5736173 *||Apr 24, 1996||Apr 7, 1998||Zygo Mold Limited||Preform injection mould with slide taper locks|
|US6093015 *||Jan 11, 1999||Jul 25, 2000||D-M-E Company||Mold core positioning device|
|US6116891 *||Mar 8, 1999||Sep 12, 2000||Progressive Components International Corporation||Mold having a side-action cam mechanism and molding method|
|US6126429 *||Jun 2, 1998||Oct 3, 2000||Burger Engineering, Inc.||Combination slide retainer and position sensing switch for injection molds|
|US6413074 *||Sep 28, 1999||Jul 2, 2002||Composix Corporation||Assembly for molding plastic material|
|US6450797||Mar 1, 2001||Sep 17, 2002||Stackteck Systems Limited||Compact slide actuation mold|
|US6638054 *||Dec 26, 2001||Oct 28, 2003||Koyo Seiko Co., Ltd.||Injection molding machine for making a worm wheel|
|US6659760 *||Aug 10, 2001||Dec 9, 2003||Taiwan Green Point Enterprise Co., Ltd.||Mechanism for moving a screw rod relative to molds for manufacturing products having holds|
|US6739856 *||May 10, 2001||May 25, 2004||Crs Srl Centro Ricerche E||Equipment for hot moulding of articles made of thermoplastic material|
|US6793862 *||Jul 25, 2002||Sep 21, 2004||Skis Rossignol S.A.||Method of manufacturing an alpine ski|
|US6929462||Nov 8, 2000||Aug 16, 2005||Hammonton Mold Co. Inc.||Mold part guide mechanism|
|US7326045 *||Apr 5, 2005||Feb 5, 2008||Top Grade Molds Ltd.||System for releasing molded part from entrapping core rings|
|US7387505 *||Nov 24, 2006||Jun 17, 2008||Cheng Uei Precision Industry Co., Ltd.||Side-action mechanism and injection mold using the same|
|US7462027 *||May 19, 2006||Dec 9, 2008||Hon Hai Precision Industry Co., Ltd.||Mold apparatus|
|US7481648 *||Nov 16, 2007||Jan 27, 2009||Cheng Uei Precision Industry Co., Ltd.||Side mold working mechanism|
|US7621543||Aug 23, 2006||Nov 24, 2009||Mattel, Inc.||Blow-molded wheels having undercut treads, methods for producing the same, and children's ride-on vehicles including the same|
|US7628605||Oct 22, 2007||Dec 8, 2009||Husky Injection Molding Systems Ltd.||Mold stack|
|US7798804 *||Apr 26, 2007||Sep 21, 2010||Husky Injection Molding Systems Ltd.||Split mold insert for a molding system|
|US7798807 *||Apr 18, 2006||Sep 21, 2010||Zimmermann Formenbau Gmbh||Plastic injection mould tool|
|US7845926 *||Dec 4, 2008||Dec 7, 2010||Hon Hai Precision Industry Co., Ltd.||Mold apparatus for forming screw threads|
|US7846370 *||Sep 9, 2008||Dec 7, 2010||Hon Hai Precision Industry Co., Ltd.||Threaded core, injection molded apparatus method for making lens barrel|
|US7905305||Aug 23, 2006||Mar 15, 2011||Mattel, Inc.||Blow-molded wheels having undulating treads, methods for producing the same, and children's ride-on vehicles including the same|
|US7939008||Oct 12, 2009||May 10, 2011||Mattel, Inc.||Blow-molded wheels having undercut treads, methods for producing the same, and children's ride-on vehicles including the same|
|US8033818 *||Feb 3, 2010||Oct 11, 2011||Cheng Uei Precision Industry Co., Ltd.||Injection mold|
|US8128799||May 8, 2009||Mar 6, 2012||Bio-Rad Laboratories, Inc.||Welded electrophoresis cassette without leakage-prone weld line|
|US8197246 *||Dec 3, 2010||Jun 12, 2012||Cheng Uei Precision Industry Co., Ltd.||Plastic injection mold|
|US8337195 *||Jun 16, 2011||Dec 25, 2012||Cheng Uei Precision Industry Co., Ltd.||Injection mold|
|US8342838 *||Oct 6, 2010||Jan 1, 2013||Cheng Uei Precision Industry Co., Ltd.||Mold with sliders|
|US8348285||May 9, 2011||Jan 8, 2013||Mattel, Inc.||Blow-molded wheels having undercut treads, methods for producing the same, and children's ride-on vehicles including the same|
|US8349240||Mar 25, 2011||Jan 8, 2013||Honda Motor Co., Ltd.||Hidden parting line mold and hidden parting line molding technique using associated part removal device|
|US8393888||Dec 6, 2011||Mar 12, 2013||Husky Injection Molding Systems Ltd.||Molding apparatus|
|US8470233 *||Mar 18, 2011||Jun 25, 2013||Stanley Electric Co., Ltd.||Metal mold for use in molding lens cover and method for producing lens cover|
|US8517716 *||Oct 25, 2011||Aug 27, 2013||Cheng Uei Precision Industry Co., Ltd.||Injection mold|
|US8550806||Feb 22, 2013||Oct 8, 2013||Husky Injection Molding Systems, Ltd.||Molding apparatus|
|US8658075||Feb 22, 2013||Feb 25, 2014||Husky Injection Molding Systems Ltd.||Molding apparatus|
|US8740610||Nov 17, 2010||Jun 3, 2014||Huskey Injection Molding Systems Ltd.||Molding apparatus|
|US8888483||Nov 28, 2013||Nov 18, 2014||Husky Injection Molding Systems Ltd.||Molded article transfer device|
|US9017062 *||Jun 1, 2011||Apr 28, 2015||Alberto Navarra Pruna||Compact slide rail for injection molds|
|US9073274||Nov 28, 2013||Jul 7, 2015||Husky Injection Molding Systems Ltd.||Molding apparatus having an in-mold shutter|
|US9138927 *||Mar 11, 2014||Sep 22, 2015||Wistron Corporation||Injection molding module having a runner changing a flow direction of plastic material fed into an inlet thereof|
|US9266265||May 28, 2015||Feb 23, 2016||Husky Injection Molding Systems Ltd.||Molding apparatus|
|US9573305 *||Jun 30, 2014||Feb 21, 2017||Green Island International TCM Group Limited||Method and device for making silicone rubber cupping appliance|
|US20030020258 *||Jul 25, 2002||Jan 30, 2003||Skis Rossignol||Method of manufacturing an alpine ski, and ski obtained in accordance with such a method|
|US20050084655 *||Oct 14, 2004||Apr 21, 2005||Orion Electric Co., Ltd.||Method for molding flat thin-plate molded product, and molded product|
|US20050098295 *||Aug 22, 2003||May 12, 2005||Dubay Richard L.||Universal slide assembly for molding and casting systems|
|US20050220929 *||Apr 5, 2005||Oct 6, 2005||Jerko Knezovic||System for releasing molded part from entrapping core rings|
|US20060202390 *||Mar 9, 2006||Sep 14, 2006||Joachim Flaig||Process and apparatus for producing components|
|US20060286196 *||May 19, 2006||Dec 21, 2006||Hon Hai Precision Industry Co., Ltd.||Mold apparatus|
|US20080006456 *||Aug 23, 2006||Jan 10, 2008||Lucas Christopher F||Blow-molded wheels having undulating treads, methods for producing the same, and children's ride-on vehicles including the same|
|US20080048406 *||Aug 23, 2006||Feb 28, 2008||Arendt Albert L|
|US20080124425 *||Nov 24, 2006||May 29, 2008||Chih-Yu Chen||Side-action mechanism and injection mold using the same|
|US20080197265 *||Feb 15, 2007||Aug 21, 2008||Gerald Taufield||Systems for Constructing Sand Structures|
|US20080251687 *||Dec 31, 2007||Oct 16, 2008||Gerald Taufield||Systems for constructing sand structures|
|US20080254706 *||Apr 11, 2007||Oct 16, 2008||Gerald Taufield||Systems for Constructing Sand Structures|
|US20080268086 *||Apr 26, 2007||Oct 30, 2008||Husky Injection Molding Systems, Ltd.||Split Mold Insert for a Molding System|
|US20080268090 *||Apr 26, 2007||Oct 30, 2008||Husky Injection Molding Systems Ltd.||Slide Assembly for a Molding System|
|US20090104303 *||Sep 9, 2008||Apr 23, 2009||Hon Hai Precision Industry Co., Ltd.||Threaded core, injection molded apparatus method for making lens barrel|
|US20090304844 *||Dec 4, 2008||Dec 10, 2009||Hon Hai Precision Industry Co., Ltd.||Mold apparatus for forming screw threads|
|US20090304850 *||Apr 18, 2006||Dec 10, 2009||Klaus-Dieter Drewlies||Plastic injection mould tool|
|US20090308751 *||May 8, 2009||Dec 17, 2009||Bio-Rad Laboratories, Inc.||Welded electrophoresis cassette without leakage-prone weld line|
|US20110189334 *||Feb 3, 2010||Aug 4, 2011||Xian Yun Wang||Injection mold|
|US20110221260 *||May 9, 2011||Sep 15, 2011||Mattel, Inc.|
|US20110227253 *||Mar 18, 2011||Sep 22, 2011||Akiyasu Koshiba||Metal mold for use in molding lens cover and method for producing lens cover|
|US20110318447 *||Jun 28, 2010||Dec 29, 2011||Cheng Uei Precision Industry Co., Ltd.||Angled Core-Pulling Mechanism of Mold|
|US20120076887 *||Sep 27, 2010||Mar 29, 2012||Cheng Uei Precision Industry Co., Ltd.||Mould having core-pulling mechanism|
|US20120088004 *||Oct 6, 2010||Apr 12, 2012||Cheng Uei Precision Industry Co., Ltd.||Mold with sliders|
|US20120141627 *||Dec 3, 2010||Jun 7, 2012||Cheng Uei Precision Industry Co., Ltd.||Plastic injection mold|
|US20130101693 *||Oct 25, 2011||Apr 25, 2013||Cheng Uei Precision Industry Co., Ltd.||Injection mold|
|US20140106022 *||Jun 1, 2011||Apr 17, 2014||Comercial De Utiles Moldes, S.A.||Compact slide rail for injection molds|
|US20140316307 *||Jun 30, 2014||Oct 23, 2014||Green Island International TCM Group Limited||Method and device for making silicone rubber cupping appliance|
|US20150004278 *||Mar 11, 2014||Jan 1, 2015||Wistron Corporation||Injection molding module and injection molding method utilizing the same|
|CN103192505A *||Apr 1, 2013||Jul 10, 2013||宁波天龙电子股份有限公司||Internal core-pulling mechanism with two-level sliding blocks for concave hole|
|CN103192505B *||Apr 1, 2013||Mar 18, 2015||宁波天龙电子股份有限公司||Internal core-pulling mechanism with two-level sliding blocks for concave hole|
|CN105500581A *||Dec 24, 2015||Apr 20, 2016||宝鸡烽火工模具技术有限公司||Mold structure|
|EP0665090A2 *||Jan 26, 1995||Aug 2, 1995||BASCHIERI & PELLAGRI S.P.A.||A method of moulding and the relative mould for the production of gun cartridge wads|
|EP0665090A3 *||Jan 26, 1995||Apr 17, 1996||Baschieri & Pellagri||A method of moulding and the relative mould for the production of gun cartridge wads.|
|EP2229269A1 *||Nov 17, 2008||Sep 22, 2010||Husky Injection Molding Systems S.A.||A split mold insert and a mold incorporating same|
|EP2229269A4 *||Nov 17, 2008||Mar 16, 2011||Husky Injection Molding||A split mold insert and a mold incorporating same|
|WO2016199949A1 *||Jun 9, 2015||Dec 15, 2016||롯데케미칼 주식회사||Compression molding apparatus and composite resin molded product using same|
|U.S. Classification||425/577, 425/451.7, 425/450.1, 425/DIG.58|
|Cooperative Classification||Y10S425/058, B29C45/332|
|Dec 2, 1988||AS||Assignment|
Owner name: SANKYO ENGINEERING CO., LTD., 1500, MIYATANI TOMIH
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:NAKAMURA, SUSUMU;YOKOI, KOICHI;REEL/FRAME:004981/0483
Effective date: 19881108
Owner name: SANKYO ENGINEERING CO., LTD., A CORP. OF JAPAN, JA
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:NAKAMURA, SUSUMU;YOKOI, KOICHI;REEL/FRAME:004981/0483
Effective date: 19881108
|Jul 27, 1993||REMI||Maintenance fee reminder mailed|
|Dec 26, 1993||LAPS||Lapse for failure to pay maintenance fees|
|Mar 8, 1994||FP||Expired due to failure to pay maintenance fee|
Effective date: 19931226